Citation: WANG Wen-Qin, ZHANG Zhi-Hua, ZU Guo-Qing, SHEN Jun, ZHOU Bin, YAO Xian-Dong. Preparation of Heat-Resistant Silica/Alumina Composite Aerogel by Adding Trimethylethoxysilane[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(1): 117-123. doi: 10.11862/CJIC.2016.020 shu

Preparation of Heat-Resistant Silica/Alumina Composite Aerogel by Adding Trimethylethoxysilane

WANG Wen-Qin ¹ ,
ZHANG Zhi-Hua ^1,*,, ,
ZU Guo-Qing ^1,*,, ,
SHEN Jun ¹ ,
ZHOU Bin ¹ ,
YAO Xian-Dong ²

1.
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China
2.
Nano High-tech Co., Ltd., Shaoxing, Zhejiang 3, 2000, China

Corresponding author: ZHANG Zhi-Hua, zzhtj@tongji.edu.cn ZU Guo-Qing, guoqingzu@yahoo.com
Received Date: 5 September 2015
Revised Date: 2 November 2015

Figures(6)

Silica/alumina composite aerogels with good heat resistance and formability were prepared by a sol-gel method combined with the ethanol supercritical fluid drying technique using aluminum trisec butoxide and trimethylethoxysilane (TMEO) as precursors. Transmission electron microscope, N₂ adsorption analyzer, fourier transform infrared spectroscope, X-ray diffraction and hot disk thermal analyzer were used to characterize the morphology, pore structure, surface groups, phases, thermal properties, etc. The-Si-(CH₃)₃ groups were introduced onto the alumina nanoparticles by adding TMEO during sol-gel process. It is demonstrated that these groups would produce SiO₂ nanoparticles, which effectively restricted the crystal growth of Al₂O₃ nanoparticles and led to the excellent heat resistance of the composite aerogels. The linear shrinkage of the obtained composite aerogel was as low as 16% and the corresponding specific surface area was as high as 141 m²·g^-1 after heat treatment at 1 200 ℃. This would further contribute to the wide application of aerogels on high-temperature thermal insulation, adsorption, catalysis, etc.
- silica/alumina composite aerogel,
- trimethylethoxysilane,
- heat resistance,
- high specific surface area
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